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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
06 Mar 2017
Review status
A revision of this discussion paper was accepted for the journal Atmospheric Chemistry and Physics (ACP) and is expected to appear here in due course.
Seasonal and Spatial Changes in Trace Gases over Megacities from AURA TES Observations
Karen E. Cady-Pereira1, Vivienne H. Payne2, Jessica L. Neu2, Kevin W. Bowman2, Kazuyuki Miyazaki2,3, Eloise A. Marais4,a, Susan Kulawik5, Zitely A. Tzompa-Sosa6, and Jennifer D. Hegarty1 1Atmospheric and Environmental Research, Lexington, MA, USA
2Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA
3Japan Agency for Marine-Earth Science and Technology, Yokohoma, Kanagawa Prefecture, Japan
4School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA
5Bay Area Environmental Research Institute/NASA Ames, Mountain View, CA, USA
6Department of Atmospheric Sciences, Colorado State University
anow at: School of Geography, Earth and Environmental Sciences, University of Birmingham, Edgbaston, UK
Abstract. The AURA TES instrument is collecting closely spaced observations over 19 megacities. The objective is to obtain measurements that will lead to better understanding of the processes affecting air quality in and around these cities, and better estimates of the seasonal and interannual variability. We explore the TES measurements of ozone, ammonia, methanol and formic acid collected around the Mexico City Metropolitan Area and in the vicinity of Lagos (Nigeria). The TES data exhibit seasonal signals that are correlated with AIRS CO and MODIS AOD, with in situ measurements in the MCMA and with GEOS-Chem model output in the Lagos area. TES was able to detect an extreme pollution event in the MCMA on April 9, 2013, which is also evident in the in situ data. TES also shows that biomass burning has a greater impact south of the city than in the caldera where Mexico City is located. TES measured enhanced values of the four species over the Gulf of Guinea south of Lagos. Since it observes many cities from the same platform, with the same instrument and applyies the same retrieval algorithms, TES data provide a very useful tool for quickly comparing air quality measures of two or more cities. We compare the data from the MCMA and Lagos, and show that while the MCMA has occasional extreme pollution events, Lagos consistently has far higher levels of these trace gases.

Citation: Cady-Pereira, K. E., Payne, V. H., Neu, J. L., Bowman, K. W., Miyazaki, K., Marais, E. A., Kulawik, S., Tzompa-Sosa, Z. A., and Hegarty, J. D.: Seasonal and Spatial Changes in Trace Gases over Megacities from AURA TES Observations, Atmos. Chem. Phys. Discuss.,, in review, 2017.
Karen E. Cady-Pereira et al.
Karen E. Cady-Pereira et al.


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Short summary
Air quality is a major issue for megacities. Our paper looks at satellite measurements over Mexico City and Lagos of several trace gases gases related to air quality to determine the temporal and spatial variability of these gases, and relates this variability to local conditions, such as topography, winds and biomass burning events. We find that while Mexico City is known for severe pollution events, the levels of of pollution in Lagos are much higher and more persistent.
Air quality is a major issue for megacities. Our paper looks at satellite measurements over...